J/Z (New York City Subway service)
| Nassau Street Local Nassau Street Express | |
| A J train of R179s at Flushing Avenue | |
| A Z train of R160s at Kosciuszko Street | |
| Western end | Broad Street | 
|---|---|
| Eastern end | Jamaica Center–Parsons/Archer | 
| Stations | 30 (J service) 21 (Z service) 20 (J skip-stop service) | 
| Rolling stock | R160 R179 (Rolling stock assignments subject to change) | 
| Depot | East New York Yard | 
| Started service | 1893 (predecessor) November 1967 (present-day J service) December 11, 1988 (present-day Z service) | 
The J Nassau Street Local and Z Nassau Street Express are two rapid transit services in the B Division of the New York City Subway. Their route emblems, or "bullets", are colored brown since they use the BMT Nassau Street Line in Lower Manhattan.
The J operates 24 hours daily, while the Z, operating as the rush hour variant to the J, operates during weekday rush hours in the peak direction only; both services operate between Jamaica Center–Parsons Boulevard/Archer Avenue in Jamaica, Queens, and Broad Street in Lower Manhattan. When the Z operates, the two services form a skip-stop pair between Sutphin Boulevard–JFK and Myrtle Avenue/Broadway and also makes express stops between Myrtle and Marcy Avenues in Brooklyn. Weekday midday J service also makes express stops between Myrtle and Marcy Avenues, while weekday evening, weekend daytime and daily overnight service makes all stops along the full route.
The J/Z's current skip-stop pattern was implemented in 1988. The J/Z is derived from four routes:
- The JJ/15 between Broad or Chambers Streets in Lower Manhattan and 168th Street in Queens
- The KK between 57th Street/Sixth Avenue in Midtown Manhattan and 168th Street in Queens
- The QJ between Brighton Beach (Coney Island August 1968–January 1973) in Brooklyn and 168th Street in Queens
- The 14 between Broad or Chambers Streets in Lower Manhattan and Canarsie–Rockaway Parkway in Brooklyn